DO NOT COMMIT - DialogSurface initial implementation.

media/base/android/java/src/org/chromium/media/DialogSurfaceCallback.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.media;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Callback helper for native.  This works with our JNI implementation to hop

[watk, 2016/06/10 21:46:38]

Maybe a naive question, but I wonder if you considered removing the need for
this class and having DialogSurfaceControllerWrapper hide this from the native
code?

[liberato (no reviews please), 2016/06/10 22:50:05]

unfortunately, i don't think that will work.  in order for the browser to use
the callback, it must have its own aidl interface.  i suppose that i could make
the controller wrapper also implement that interface, but not sure that wouldn't
be confusing.

the java object holds the callback, and the controller.cc holds the java object.

+ * to the right thread for callbacks, and handle async deletion of the native
+ * object.  This isn't a wrapper because it's only used for native, and it's

[watk, 2016/06/10 21:46:38]

Probably could delete the wrapper comment since it probably doesn't make a lot
of sense to anyone looking at this file in isolation.

[liberato (no reviews please), 2016/06/10 22:50:05]

Done.

+ * always created locally with respect to the JNI calls.  There's no need to
+ * wrap a remote instance for JNI.
+ */
+@JNINamespace("media")
+class DialogSurfaceCallback extends IDialogSurfaceCallback.Stub {
+    private final long mNativeId;
+
+    public DialogSurfaceCallback(long nativeId) {
+        mNativeId = nativeId;
+    }
+
+    @CalledByNative
+    public static DialogSurfaceCallback create(long nativeId) {
+        return new DialogSurfaceCallback(nativeId);
+    }
+
+    @Override
+    public void onCallback(int what) {
+        nativeOnDialogSurfaceCallbackCallback(mNativeId, what);
+    }
+
+    private static native void nativeOnDialogSurfaceCallbackCallback(long id, int what);
+};